A British man is on a missing underwater vessel that was taking tourists to visit the Titanic shipwreck.

Hamish Harding, the chairman of Action Aviation, a high-end private plane selling and management company, is among the crew on the expedition.

The underwater vessel disappeared off the coast of southeast Canada on Sunday, and has just 70-96 hours of oxygen supply left, as of Monday evening.

The submersible lost contact with Oceangate on Sunday, one hour and 45 minutes after setting off to explore the infamous ship's wreckage, about 370 miles away from Newfoundland.

Earlier on Monday, the US Coastguard launched a search and rescue mission off the coast of Newfoundland, Canada to find the missing submersible, which is understood to be owned by company OceanGate Expeditions.

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